Cast-metal cutting die and process of producing the same



J. E. SWANSON CAST METAL CUTTING DIE AND PROCESS OF PRODUCING THE SAME Filegl Oct. '7, 1922 Im/e ni'olr. John E. Swanson 79M M Q Patented .luly 11, 12 i.

JOHN E. SWANSON, OF JAMAICA. PLAIN, MASSACHUSETTS.

.CAST-METAL CUTTTNG DIE AND PROCESS OF PRODUCING THE SAME.

Application filed October 7,

To. all whom it may concern:

Be it known that 1, Joan E. Swanson a citizen of the United States, and resident of Jamaica Plain, county. of Suflt'olk, State of Massachusetts, have invented an Improvement in Cast-Metal Cutting Dies and Processes of Producing the Same, Olf-Wl113l1 the following description, in connectlon wlththe accompanying drawing, is a specification, like characters on the drawing representlng like parts.

This invention relates to improvements in processes for casting hollow articles and more particularly relates to processes tor casting hollow cutting dies such as are used in cutting leather and other materials into predetermined forms as for soles and uppers of shoes, etc.

In themanufacture of shoes and hke articles where different sizes are made, large numbers of different sizes and forms of dies are required. Such cutting dies have heretofore been produced by forglng strips of steel to correspond to the form of a templet and welding the edges together. This requires highly skilled labor and the production is very slow indeed. The ob ect olf he present invention is to provide a s mple-a d convenient process and means for readlly and accurately producing cutting dles and like articles by casting molten material, preferably in a sand mould. 1 v Certain of the dies used in cuttlng leather and like articles have been provided with a central handle which is connected to e a spider, the ends of which are welded to the upper portion of the-die A further ob ect of the present invention is to produce a handle die in which the spider or the handle and spider together are cast integrally with the die. 1

Other objects and features of the invention will more fully appear from the following description and the accompanying drawing and will be pointed out in the claims.

The accompanying drawing is designed to illustrate the steps in the process forproduo ing a cast metal cutting diein accordance with the present invention and also illustrates one form of die which can be made in accordance with said process.

In the drawing; 7

Fig. 1 is a vertical sectional view of a threeapart flask showing assembled] therein the platen, a series of units assembled there.-

1922. Serial No. 592,998..

. upon, said units corresponding in cross section to like portions of the die and the spider and handle all embedded in the members of the, three-part flask;

Fig. 2 illustrates a preferred form of temple t having a number of units corresponding to sections of the die assembled thereupon;

Fig. 3 is a vertical sectional view corresponding to Fig. 1 in which the cope, cheek and drag sections of the mould are separated in superposed relation, the templet and units of the pattern having been withdrawn. whereby the flask when assembled Willbe ready to receive the molten metal; and,

. Fig. 4 is a produced bythe process embodying the invention in the flask andmould illustrated in Figs. 1 and 2.

The present invention comprises certain improvements upon the invention disclosed in Patent No. 1,365,075 granted January 11, 1921, to Carl G. Anderson and John E. Swanson for processes and apparatus for producing cutting dies and consists mainly in a simplification of the process disclosed in that patent.

Broadly speaking, the present invention conslsts in forming a mould cavity for a die or other hollow article in a sand flask in such a manner that the article can be readily cast therein, and further in providing a process forproducing an integral handle cutting'die.

his process consists in a certain arrangement of a templet and associated pattern units so devised that they can be readil manipulated to produce a sand mould into which molten metal or other material may be cast to form the desired hollow article.

In order more fully to disclose the invention the apparatus used in the performance of the process is. illustrated herein.

In the performance of the process a usual multi-part flask is employed such as are commonlyused in foundries. This flaskas illustrated inthe accompanying drawing is a three-part rectangular flask. The lower member 1 or drag of the flask is shown as resting upon a suit-able board or base 2 and having superimposed thereupon the intermediate section or cheek 3 upon which the upper member or cope 4 of the flask is superimposed. The cheek member of the flask is provided with metal brackets 5 having up wardly and downwardly extending pmtles perspective view of a handle die providing a novel process of forcing spider. for the die or to the spider 6 and 7 adapted to pass respectively through apertures in brackets 8 and 9 upon the cope and drag. as is usualin flask constructions. In the performance of the process the lower or drag member 1 is filled with molding sand 10 preferably substantially even with its top, and covered withthe usual parting material. A templet is placed upon the sand bed 10 thus formed. This templet de sirably is in the form of a block 11 which has, a: contour substantially conforming to thelcoutour of the article to be formed.

As-illustrated. in F ig. 2the templet 11 is in'the form of a shoe sole and for convenience and accuracy in construction has secured to. its top and bottom patterns 12 andyl3. which are produced accurately upon the-usual pattern grading machines, the

marginof-the patterns 12 and 13 preferably extending. slightly beyond the wall of the block 11. The templet thus formed is placed upon the upper surface of the sand bed 10. A series of units 14, having a cross section corresponding to the cross section of like portions of the die tov be cast, areassembled upon thistemplet with their edges juxtaposed. ,The'cheekmember of the mould is then filled with a body 15 of sand and suitably tamped therein.

A. pattern '16, corresponding to a re-enfor a; handledie,-is then placed upon the top, of: the platen and units as illustrated in Fig.1. Where ahandle die is to be used a l; conical pattern member 17 is assembled upon the spider pattern and the cope member of the mould then filled with a body of sand 18. and properly tamped. lVhen this I isdone the conical pattern 17 is withdrawn,

4. the cope member raisech removed and reversedandthe pattern 16 withdrawn there .The. templet is then withdrawn from the cheek member and the space'occupied by it filled with abody of sand'19 to form a core for the hollow article or die. The units 14 are thereupon withdrawn, thereby leaving continuous cavity extending entirely through the cheek member.

Byreason of this construction the cheek member. can be readily removed and the outer wall of the die, which is represented by the inner face of the layer of sand, can be smoothed bythe usualfoundry slicking tool.

F g. The inner wall of the mould cavity, which istheouter Wall of thebody 19of sand, is likewise'freadily' accessible to the founder and can. likewise be easily smoothed with the slicking tool. When this is accomplished thecheek member may be replaced, the

propermouldcavity for the die or other articlebeing thereby produced. The cope may thenbe assembled on the cheek member of thefiask andthe molten material poured in h -ai 'u lman er.

and 22 for the spider arms extending therefrom to the conical central aperture 23 which may be employed in place of the usual gate or sprue hole, thereby effecting the saving of the metal which usually constitutes the sprue of a casting. i

The molten metal, upon being poured into the handle gate which corresponds to the sprue hole, runs readily along the cavities for the spider arms into separated portions of a cavity for the blade. By thus supplying the cavity for the blade with metal at separated intervals a more perfect continuous casting is assured than if the metal were poured in at one or two places from different sprue holes supplied at different times. By the process above described dies and other hollow articles can be cast with great accuracy so that it is seldom necessary to reject a defective casting.

The handle die cast in the manner above described is illustrated in Fig. 4 and comprises a continuous blade 24 to the upper edge of which extend arms 25. 26 and 27- wliich radiate from a central hub 28 and a handle 29 which is integral with the hub. Thus by the novel process described a novel integral cutting die may be produced, which is less expensive to manufacture and is accurate in construction. By the process above described the difliculties which attended the production of cast metal dies have been eliminated and the practical and commercial production of cutting dies and like articles assured.

It will be understood that the apparatus for performing the process and the steps of the process herein recited may be modified within the meaning and scope of the claims.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is: i

1. The process of moulding hollow articles which consists in placing in a suitable mould a templet having a contour conforming substantially to the inner wall or walls of the article, arranging upon said templet a series of juxtaposedunits corresponding in cross section to like portions of the wall or walls of the article to be cast, filling the mould with sand, removing the templet, filling the space occupied by the templet with sand to form a core, withdrawing the units and pouring the molten material to form the article into the mould thus produced.

2. The process of casting hollow cutting dies which consists in arranging within a sand mould a series of units juxtaposed at dies which consists in placing within a suitable mould a templet having a contour conforming substantially to the inner wall of the die, arranging upon said templet a series of units corresponding in cross section to like portions of the wall of the die, filling the mould with sand, removing the templet, filling the space occupied by the templet with sand to form a core, withdrawing the units, reassembling the mould and pouring the molten metal to form the article into the mould cavity thus produced. I 4. The process of casting hollow cutting dies in a suitably parted three-part flask which consists in substantially filling the drag portion of the flask with sand and placing within the cheek portion of the flask a block havin upper and lower templets conforming su stantially to the inner wall of the article, arranging upon said templets a series of juxtaposed units corresponding in cross section to like portions of the die, filling the cheek portion with sand, withdrawing the templet and filling the space occupied thereby with sand, superimposing the cope upon said check member andfilling the same with sand, withdrawing said units, replacing said cope and pouring the molten metal into the die cavity thus formed through a suitable gate in said cope.

5. The process of casting hollow cutting dies in a three-part flask which consists in forming by a pattern in the cheek member of the flask a mould cavity corresponding in cross section to that of the die and extending through the sand of said cheek member, withdrawing the pattern, removing the cheek member, slicking the outer wall of the mould cavity carried thereby and the inner wall of the cavity supported by the drag member of the flask, replacing the cheek member and cope and pouring the molten metal into the mould cavity thus formed through a suitable gate in said cope.

6. The process of producing handle cutting dies in a three-part flask which consists in substantially filling the drag member of the flask with sand, placing within the cheek member a templet corresponding in contour with the inner wall of the cutting die, assembling upon said templet a series of units corresponding in cross section to like portions of the die, filling the cheek member with sand, removing the templet and filling the space occupied thereby with sand, placing upon the assembled units" the pattern of the handle member comprising a spider and a handle extending from the hubthereof, removing the cope, withdrawing the pattern therefrom, withdrawing the units to leave a mould cavity for the die, removing the cheek section to permit the slicking of the outer wall of the mould cavity contained in said cheek member and the inner wall of the mould cavity carried by the drag member reassembling the flask and pouring the molten metal through the sprue hole of the cope member:

In testimony whereof, I have signed my name to this specification.

JOHN E. SWANSON.

Hit 

